"We hit upon the idea of going into Manchester and setting up in front of cameras we knew would be filming and then requesting that footage under the Freedom Of Information act."

Only a quarter of the organisations contacted fulfilled their obligation to hand over the footage – perhaps predictably, bigger firms were reluctant, while smaller companies were more helpful – but that still provided enough for a video with 20 locations.

"We had a number of different excuses as to why we weren't given the footage, like they didn't have the footage. They delete after a certain amount of time, so if they procrastinate for long enough, they can claim it's been deleted," Mr Churnside said.